Broach bar assembly



July 25, 1950 Filed May 21, 1948 ARV N. H. IVERSEN BROACH BAR ASSEMBLY 2 Sheets-Sheet 1 INVENTOR lvornwn II. Iver-sen ATTORN EYS July 25, 1-950 N. H. IVERSEN BROACH BAR ASSEMBLY Fil'ed May 21., 1948 2 Sheets-Sheet 2 INVENTOR Norman H. Iversen BY 5 rh ORNEYS ATT Patented July 25, H350 smreis BROACH BAR Net-ma H;*'. Y ."en B r i m, c ss n to The-Pro duction Broaching Corporation, De

' troitgMich a; corporation. of Delaware Application Mei/3121,1948, Serial No. 28,298

fiClaims, 1:11

This nt on re at o. a roaqhass mblnm which ,aseries of, elongated; breach bars are a];- e i aneu rol paced. ati .v out! central axis for cutting externai gro er/ esin work e e oved x l r hmueh. he s mblyo rm v x e a ieee i eeth nes-vi Y e in ntionh sr or npbiectt arroridee. broach a semblyina ieh .aseri s on itudi al. r a a are. i id ysupn tee iid,.. cc rately. posi i nediwith nn yli d Q. backinemwber y eans of o i ief. iids eeinamember rt iat, a e e barsto be uicklr. dp asi y as emb ed. or disassemb1ed.

A r r-. o ec ii he i venti n is o v provi ean a e b y, in wh ch the. reach bars. e, Desi-. on d, by mea sof i term diate nd aci an holding means that have T positioning channels in which the bars fit.

An add t enali biecti tofiir v dei er eta ner in the form, of, expansibie resilient rings that, exert outward pressure on the broach bars tc old he in snueeneaement Wi sthe. ba k member.

R f ence hou dbe had he, s cm draw n s f min apart or this. sp c fic ti n n t which:

F ure 1 is. a. n it dinal entr l. ectien. hr ugh a breac ssembly? emb d ing e nvention;

Fig.- 2 is an end elevation oi. the assembly;

Fig. 3. is. a-transversesection.takencn theline indicated at 3:311; Fig, 1;

Fig, 4. isia i lanvi wa of, the split ex ansi le holding ring;

Fig. 5 .is atransverseSectiontakenon the, line. indicated ,at 5 =5,,in,Fig, 1;

Fi 6 is a .pl nri wi inne ith nd-ret i rings; 1

Fig. 7 is a side elevation of the retaining ringn shown-in F ig- 6-;-

Fig. 8 is a plan view of the intermediate spacing ring; and

i .3 is aside eieyationoi the intermediate spacing ring. v

The breach assembly of the present invention includes a rigid internally 'cylindrical backing member-preferably composed of-sections secured together end toend As herein shown the baclging. member-:18 composed of sectiol n sl and- 2 and theadjoini-ng endS oi the sections;. l andfl haveg outwardly projecting flanges 3 and 4 that are secured together end to end. As herein shown the backing member is composed of sections l and 2 and the adjoining ends of the sections I and 2 have outwardly projecting flanges 3 and. 4

20- n i inthe, eqkiee..,member,a e a en ine,.. 2m

i5 v achmf.

projections; [300i thebroach, bar s the. resilien that are secured togetherf by suitable means-such as bolts 5.

one of the ons. s here n hqwejtheeeet qe. r v ed w t e i eelreeessfi ttheeee;

thereof that adjoinsth'esectionj whichreceives a positioning ring 1 that fits within jahetrecess fig One end portion of the ring lhasan internal" cylindrical surface 8 substantially flush with; the interiorpf e ae sme ib t. heevrosiie r r n it e i g. esreiiia i lqt ps he. 1181s t are ell'vi paced 1 ;?reli ,1 2".theov periphery jthe in ani herinei ac us r. os ned; and eld. ainst i is iim e re m e y uiteble.;,meei s ueh as n ers to .-.v e ne y e v eesanie med' e. as; r n ud na r aeh he e n is ed i athe, ckin mem r, ndw siaee s ei ee ilvethe. abutting ends of; bars I, l i and 12 secured together e ei bu t n nds 1ttii: a r. .m channeled... of the ring 1. The bar s lj and lgtap erupwardly and have outer edges that fit against thelcy li el nte io i oii herbaels eamempen. ha r posite ends o f ea h oii t dt i aei iu e i ihl The ha erably of uniform I and I here. etained? n, the-.b ans u nperian 19W? e a 4 I which srpreyidedw ts ar yl eslri lifla e .6.. a fits ,within... he; vl niti l; member andthat is oj aragial thic ess co sponding.-to.the.wifilthoi he pro ect i he, cy1i di7ica ...fianse eme-pr dw ith rent s; Mi -inflic l i v were nus kiw ee emmelimercan nan-nee J Mattresse the dsof the a sili aga nst-ma ntain. v

of the backing member.

he mei ns 341f ma erere slilenei b ll I I and it hat hut n he. hannel iiafl revidei ic mieren iall v lm-em rensiier e reces es: at; he-Jo t etw n -w erei oc eeiiieiai ele a ring,l,8,identi, ;3 1 WitILthQliR i e IlgagiQg the p jections l3. atithe upper and .lowe'r ends o f, the; backina ember he in s.- the transverse; sp1it .l9 th t permitsthe ing it 'it t e omei on ract l eht n r nse t h amin aveman-re rrandencie pro e tions law mess-J11: hehi ee estw h terior of the backing member.

The lower retaining ring I5 is secured to the lower end of the holder with its grooves l1 axially alined with the grooves 9 of the intermediate positioning ring by suitable means such as screws 20.

At the upper end of the tubular backing member there is a guide ring 2| that has a cylindrical flange 2'2 fitting within the upper retaining ring l4 and provided with an external circumferential recess 23 at its lower end to accommodate the upper holding ring I8. The rings I 4 and 2| are secured in place with the grooves ll of the retaining ring l4 alined axially with the grooves 9 of the intermediate ring 1 by suitable means such as screws 24.

The work is fed through the guide ring 2! at the upper end of the broach assembly and is acted upon by teeth 25 formed along the inner upwardly tapering edges of the alined broach bars I l and I2, and since the teeth of the breach bars are in longitudinal alinement and circumferentially spaced, circumferentially spaced grooves are formed in the work piece as it passes through the broach assembly.

It i to be understood that in accordance with the provisions of the patent statutes variations and modifications of the specific devices herein shown and described for purposes of illustration may be .made without departing from the spirit of the invention.

What I claim is:

1; A broach assembly comprising a tubular internally cylindrical backing member, end psitioning rings of less internal diameter than said backing member secured to the ends of said member, said positioning rings having alined channels extending radially outwardly from their inner edges, longitudinally tapering broach bars having toothed inner edges and outer edges hearing against the interior of said backing member, said bars having rabbets providing projecting end portions fitting in the channels of said positioning rings, and expansible holding rings engaging projecting end portions of said bars to hold the same against the interior of said backing member. I

2. A broach assembly comprising a tubular internally cylindrical backing member, end positioning ring of less internal diameter than said backing member secured to the ends of said member, said positioning rings having alined channels extending radially outwardly from their inner edges, longitudinally tapering broach bars having toothed inner edges and outer edges bearing against the interior of said backing member, said bars having rabbets providing projecting end portions fitting in the channels of said positioning rings, said end portions of the bars having outer faces flush with the interiors of said positioning rings, and expansible holding rings engaging the outer faces of the projecting ends of the'bars and the interior of said positioning ring. i

3. A breach assembly comprising a tubular internally cylindrical backing member, end positioning rings oif' lessjinternal diameter than said backing member secured to the ends of said member, said positioning rings having alined channels extending radially outwardly from their inner edges, longitudinally tapering broach barshaving toothed inner edges and outer edges bearing against the interior of said backing member, said bars having rabbets providing projecting end portions; fitting in the channels of said positioning rings, said end portions of the bars having outer faces flush with the interiors of said positioning rings, expansible holding rings engaging the outer faces of the projecting ends of the bars and the interior of said positioning ring, and a guide ring having a tubular portion fitting within one of said positioning rings and having an inner end portion externally rabbeted to receive the holding ring.

4. A broach assembly comprising a tubular backing member composed of sections secured together end to end, an annular spacing ring of less internal diameter than said sections clamped between adjoining ends thereof, said ring having angularly spaced internal axial channels, end retaining rings of less internal diameter than said backing member detachably secured to the ends of the backing member and having angularly spaced radial channels alined with the channels of said spacing ring, and longitudinally extending broach bars clamped between said retaining rings and having portions fitting in the channels of said retaining and spacing rings.

5. A broach assembly comprising a tubular backing member composed of sections secured together end to end, an annular spacing ring of less internal diameter than said sections clamped between adjoining ends thereof, said ring having angularly spaced internal axial channels, end retaining rings of less internal diameter than said backing member detachably secured to the ends of the backing member and having angularly spaced radial channels alined with the channels of said spacing ring, longitudinal broach bars arranged end to end and having abutting ends positioned in said axial channels of said spacing ring and their opposite ends in said radial chann'els of said retaining rings, said bars having rabbets at their ends providing projections spaced outwardly from their inner edges, and expansible holding rings engaging said projections to hold said bars against the backing member.

6. A broach assembly comprising a tubular backing member composed of sections secured together end to end, an annular spacing ring of les internal diameter than said backing member clamped between adjoining sections of said backing member, said ring having angularly spaced internal axial channels whose bottoms are substantially flush with the interior of said backing member, longitudinal broach bars having their ends abutting in said axial channels, the abutting ends of said bars being rabbeted to provide transverse inwardly facing circumferentially alined recesses at the adjoining ends thereof, an expansible holding ring in said recesses and pressing said bars against said backing member, and holding ring engaging the ends of said bars at opposite ends of the backing member.

NORMAN H. IVERSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 439,437 Smith Oct. 28, 1890 1,070,561 Walker Aug. 19, 1913 1,909,840 Muller May 16, 1933 

